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SubjectRe: Opinion on ordering of writel vs. stores to RAM


On Sat, 9 Sep 2006, Paul Mackerras wrote:
> >
> > although it's quite possible that (a) never makes any sense at all.
>
> Do you mean (b) never makes sense?

Yes.

> I suspect the best thing at this point is to move the sync in writeX()
> before the store, as you suggest, and add an "eieio" before the load
> in readX(). That does mean that we are then relying on driver writers
> putting in the mmiowb() between a writeX() and a spin_unlock, but at
> least that is documented.

Yeah, that sounds reasonable.

Linus
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